JPS55141831A - Switching system for reference input of phase synchronizing circuit - Google Patents

Switching system for reference input of phase synchronizing circuit

Info

Publication number
JPS55141831A
JPS55141831A JP4978579A JP4978579A JPS55141831A JP S55141831 A JPS55141831 A JP S55141831A JP 4978579 A JP4978579 A JP 4978579A JP 4978579 A JP4978579 A JP 4978579A JP S55141831 A JPS55141831 A JP S55141831A
Authority
JP
Japan
Prior art keywords
input
reference input
phase comparator
control voltage
frequency divider
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4978579A
Other languages
Japanese (ja)
Inventor
Shinichi Kawada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP4978579A priority Critical patent/JPS55141831A/en
Publication of JPS55141831A publication Critical patent/JPS55141831A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To reduce the transient frequency fluctuation when switched to the spare unit, by detecting the control voltage of the control oscillator immediately before the selection of the reference input, setting the count value of frequency divider based on this control voltage, and using the switching system where the output of the frequency divider is taken as the comparative input of the phase comparator. CONSTITUTION:When the reference input is switched from the existing use input terminal 1 to the spare input terminal 2, the switched reference input is input to the phase comparator 5 and the connection between the phase comparator 1 and the low pass filter 6 is open with the first switch 10 for one period of the reference input. While this opening, the reference input is fed to the frequency divider 8 via the second switch 11. Simultaneously, the control voltage of the control oscillator VCO7 immediately before the switching is detected at the detector 12. The count value of the frequency divider 8 is set based on this control voltage. Further, the output pulse of VCO7 is frequency-divided based on the set value and the output is taken as the input of the phase comparator 5.
JP4978579A 1979-04-24 1979-04-24 Switching system for reference input of phase synchronizing circuit Pending JPS55141831A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4978579A JPS55141831A (en) 1979-04-24 1979-04-24 Switching system for reference input of phase synchronizing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4978579A JPS55141831A (en) 1979-04-24 1979-04-24 Switching system for reference input of phase synchronizing circuit

Publications (1)

Publication Number Publication Date
JPS55141831A true JPS55141831A (en) 1980-11-06

Family

ID=12840805

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4978579A Pending JPS55141831A (en) 1979-04-24 1979-04-24 Switching system for reference input of phase synchronizing circuit

Country Status (1)

Country Link
JP (1) JPS55141831A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0262836U (en) * 1988-10-28 1990-05-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0262836U (en) * 1988-10-28 1990-05-10

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